643590 has 24 divisors (see below), whose sum is σ = 1673568. Its totient is φ = 171600.

The previous prime is 643589. The next prime is 643619. The reversal of 643590 is 95346.

It is a happy number.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643590.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3486 + ... + 3665.

It is an arithmetic number, because the mean of its divisors is an integer number (69732).

2⁶⁴³⁵⁹⁰ is an apocalyptic number.

643590 is an abundant number, since it is smaller than the sum of its proper divisors (1029978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643590 is a wasteful number, since it uses less digits than its factorization.

643590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164 (or 7161 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 643590 is about 802.2406122854. The cubic root of 643590 is about 86.3382210113.

The spelling of 643590 in words is "six hundred forty-three thousand, five hundred ninety".